(2a/a²-4 )- (1/a-2)化简

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(2a/a²-4 )- (1/a-2)化简

(2a/a²-4 )- (1/a-2)化简
(2a/a²-4 )- (1/a-2)化简

(2a/a²-4 )- (1/a-2)化简